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correlational
positive effect

Taking 3 grams of glycine before bed might help people who have trouble sleeping sleep better, according to sleep monitoring equipment

Scientific Claim

Glycine ingestion (3 g) before bedtime is associated with improved sleep quality in individuals with chronic sleep dissatisfaction, as measured by polysomnography

Source Excerpt

Glycine improved subjective sleep quality and sleep efficacy (sleep time/in-bed time), and shortened PSG latency both to sleep onset and to slow wave sleep without changes in the sleep architecture.